Pulverizing mill



p 1967 w. J. SACKETT, SR

PULVERIZING MILL 4 Sheets-Sheet 1 Filed April 16, 1965 INVENTOR Her J. Saw??? PULVERIZING MILL Filed April 16, 1965 4 Sheets-Sheet 2 v INVENTOR Wa/fer J. $00k@ff,$r:

BY Mam/U 204 ATTORNEY Sept. 19, 1967 w. J SACKETT, SR 3,342,426

PULVERIZING MILL Filed April 16, 1965 4 Sheets-Sheet INV EN TOR Wa/fer J. Sac/rerf,$x

BY Maw/U 9. $2M

d ATTORNEY p 1967 w. J. SACKETT, SR

PULVERIZING MILL 4 Sheets-Sheet 4 Filed April 16, 1965 INVENTOR Wa/fer J; Sack, Sr;

United States Patent 3,342,426 PULVERIZING MILL Walter J. Sackett, S12, 3700 Echodale Ave., Baltimore, Md. 21206 Filed Apr. 16, 1965, Ser. No. 448,686 1 Claim. (Cl. 241-189) ABSTRACT OF TIE DISCLOSURE A rotor having a plurality of lengths of chain mounted at one end to the rotor, with the other end being free to extend by centrifugal force upon rotation of the rotor, is mounted within a housing for receiving coarse material, the material being comminuted upon impact with the lengths of chain, with a curtain of chains being tangentially positioned adjacent the periphery of swing of the lengths of chain mounted to the rotor to receive the material impacted thereby for further comminution of said material.

This invention relates generally to comminution devices, and more particularly it pertains to a machine for reducing oversize material without excessive flouring action.

Many products are more attractive and store and ship better in pellet or grain form. The general types of grinding and crushing mills usually grind too fine and the flour resulting is hard to handle, clogs machines, and tends to cement in storage.

It is an object of this invention to provide a pulverizing mill for reducing material to granules with a minimum of powdering.

Another object of this invention is to provide a selfcleaning rotor and stator elements in a pulverizing machine.

Still another object of this invention is to provide a pulverizing mill which is efiicient, simple, and economical to manufacture and easy to install and maintain.

Other objects and attendant advantages of this invention will become more readily apparent and understood from the following detailed specification and accompanying drawings in which:

FIG. 1 is a perspective view of a pulverizing machine incorporating features of this invention;

FIG. 2 is a vertical section taken on line 2-2 of FIG. 1;

FIG. 3 is a vertical section taken on line 3-3 of FIG.

FIG. 4 is a horizontal section taken on line 4-4 of FIG. 2; and

FIG. 5 is a fragmentary vertical section taken on line 5-5 of FIG. 2 showing details of the blanket.

Referring now to details of the invention, FIG. 1 depicts generally a pulverizing mill embodying features of this invention. This mill 10 consists of an essentially rectangular housing of metal which comprises a pair of halves 12 and 14 which are flanged and bolted together at a junction 16.

The upper half 12 is flanged at the top and provided with a cover 20. The cover 20 has a materials feed aperture 22 where the coarse material for pulverizing is introduced. Hatches 24 for access to the interior are provided in the cover 20 as Well as on the side of the half 12.

The lower half 14 of the mill 10 is flanged and open on the bottom to provide a discharge port 18. Support brackets 26 are provided on opposite sides for journals 28.

3,342,426 Patented Sept. 19, 1967 These journals 28 carry a shaft 30 which is centered at the flanged junction 16 and extends completely through the mill 10 from one side to the other.

As shown best in FIGS. 2, 3, and 4, three discs 32 are mounted axially and secured in spaced relationship on the shaft 30. An even number of thru-bolts 34, circumferentially spaced, extend serially through these discs 32 and short lengths of chain 36 are linked by one end thereon. Spacers 38 are provided to space the chains 36 on one thru-bolt 34, a lateral distance of a half link relative to those chains 36 on the adjacent thru-bolt 34. Thus, when the shaft 30 is rotated, the chains 36 extend radially by centrifugal force and sweep interleaved paths within the housing of the mill 10.

Near the top of the upper half 12 of the mill 10 and proximate to the side adjacent the feed aperture 22, there is provided a pair of rods 44 which extend thereacross as shown best in FIGS. 2 and 5. Lengths of chain 42 are hung on these rods 44 and are held in spaced relationship by spacers 46. The spacers 46 on one rod 44 are such as to displace the chains 42 a half link relative to those on the other rod 44, thus making up a dense curtain or blanket 40 hanging close to the periphery of the swing of the rotor chains 36.

In operation, a deflector plate 48 mounted below the feed aperture 22 directs the coarse materials there introduced to fall against the chains 36 (rotating in the direction of the curved arrow in FIG. 2). Lumps of material are struck sharply by these chains 36 and thrown against the curtain or blanket 40 for further break-up. The continual movement of the chains 36 and 42 cause a selfcleaning action whereupon oversize pellets or grains of material are dislodged and fall out the open discharge point 18.

Obviously many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claim the invention may be practiced otherwise than as specifically described.

What is claimed is:

A mill for the comminution of coarse material, comprising structure defining a housing having a feed aperture for said coarse material, rotating means positioned within said housing and having a plurality of short lengths of chain, with each length of said chain having one end attached to said rotating means and its opposite end free to extend b centrifugal force upon rotation of said rotating means to strike and thereby comminute said coarse material when passing through said housing, a plurality of chains forming a curtain spaced tangentially from the periphery of swing of the free end of each said chain to receive and thereby strike material initially struck by said lengths of chain, and a deflector plate positioned between said feed aperture and said curtain for deflecting said coarse material fed through said feed aperture into said rotating means.

References Cited UNITED STATES PATENTS 359,630 3/1887 Pratt 241-193 X 1,703,956 3/1929 Royer 241-193 X 2,525,023 10/1950 Ensminger 241-193 X 2,555,879 6/1951 Fogle 241-189 X 3,044,718 7/1962 Sackett 241-189 WILLIAM W. DYER, JR., Primary Examiner.

HARRY F. PEPPER, JIL, Examiner. 

